Furnace-shield.



w. s. Roc'kwELL.

FURNACE SHIELD.

APPLICATION FILED .IUNE IB. I9I7.

Patented oct. 30,1917.

2 SHEETS-SHEET I.

w. s. RocKwELL.

FURNACE SHIELD. APPLICATION FILED IUIIE I8. ISII.

Patented Oct. 30, 1917.

2 SHEETS-SHEETv 2.

STATES WLTEB S. vROGKITIEEIIII., 0F NEW YORK, N. Y., ASSIGNOB TO W. S.ROCKWELL COMPANY,

OF NEW YORK, N. Y.,

.A CORPORATION OF NEW JERSEY.

. FUBNACE-SEIELD.

Application led June 18, 1917. Serial No. 175,318.

To all whom t may concern.'

Be it known that I, WALTER S. Rooi'iwnnr., a citizen of the UnitedStates residingv at 300 West 106 street, New York, county .of New York,State of New Yor have 1nvented certain new andd useful Improvements inFurnace-Shields, fully described and represented in the followingspecification and the accompanying drawings, forming a part of the same.

This invention relates to a means of protecting the operator of afurnace from the hot flaming gases which escape from the doorway orworking-opening and is a modliication of that shown in my Reiue PatentNo. 13,713 dated April 14, 1914.

The operator is often much exposed to the heat of the gases whenmanipulating the bars or other stock inserted in the doorway forheating, and many furnaces areunprovided with any door for theworking-openm n such furnaces the doorway forms an outlet forthecontinuous discharge of the hot gases, which thus cause inconvenienceand suffering to the operator when standing before the doorway.

This invention is designed to protect the operator from such heat bymeans of a hood forming an upright flue upon the furnacefront over thedoorway through which iue the heated gases may be directed positivelyupward instead of blowing outward upon the operator.

In the hood of the Reissue Patent No. 13,713, the iue is traversed byair-pipes in which air was heated, and such hot air delivered to thecombustion-chamber of the furnace to promote combustion; but the casesVis gases by a refractory lining to the shield, and an extension of thebrick-work through the furnace-front into the sides or casing of thehood. In this invention a sill is projected from the doorway beneath themouth of the hood, and the outerV side of the hood is formed of anadjustable shield which may be raised and lowered at pleasure, and canthus be lowered to direct the hot gases wholly into the hood.

The adjustable shield 1n the present 1nside elevation vention furnishesthe sole means of restricting or preventing the discharge of hot gasestoward the operator as the doorway itself isprovided with no oor butopens into the bottom ofthe hood so that it is in constant communicationwith the draft-flue in the hood.

Such disposal of the gases wholly protects the operator from the heatwhether he is or is not manipulating the bars or other articles placedin the heating-chamber.

To increase the upward draft within the hood, a blast-pipe may beinserted within the mouth of the hoodv and a blast of air projected topropel the hot gases into the hood.

jector, to drawthe gases-by suction from the doorway, and in great partprevent their discharge toward the operator when he is manipulatingarticles within the furnace; or the blast may be directed obliquelydownward toward the sill and doorway, as in the said. reissue patent,thus intercepting the outward current of the hotgases and compellingthem to escape through the hood.

In these various embodiments of the invention, the sill adds 4materiallyto the effectiveness of the device as it 'prevents any upward rush ofcold air into thehood.

Such a hood stands upon the furnacefront above the working-opening, andto prevent radiation of heat from such hood -toward the operator itsouter side is formed as a shieldlformed vof or lined with refractorymaterial, and the opposite sides of the hood are lined with brick whichmay be made continuouswith the brick-work of the furnace-body, Such ahood thus operates to prevent the hot .gases from annoying the operatorand prevents their heat, when drawn into the hood, from radiating outward in any direction. The shield is preferably adjustable on the hood.

This forin of apparatus is illustrated in the annexed drawing, in whichFigure 1 is a of a furnacevprovided with the apparatus; Fig. 2 is alongitudinal section of the same; Fig. 3 is a horizontal section' of theforward end of the furnace taken on line3-3 in Fig. 4; and Fig. 4 is avertical section taken on line 4-4 in Fig. 3; Fig. 5 is a frontelevation of the furnace;

Patented Oct. 30, 1917.

rsi

having` the casing for the hood integral therewith; Fig. 7 is a frontelevation ci the ilirnace-body with the hood in section on 3 line 7 5(in Fig. 3; and Fig. 8 is a front view of the detachable shield of thehood. Fig. 9 shows an alternative arrangement oi the blast-pipe. Y

A designates the furnace-body formed of bricleworlr with aheating-cherchera therein, from the iront end of Vwhich chamber the-working-opening or doorway b is extended to introduce the stoclr to beheated. Such opening is termed the doorway `for `oonvenience herein. i

. Fluid fuel-burners B are shown in Figs. 1

and for heating the chamber a, and airpipes C and gas-pipes D are shownconnected with the burners. lt is immaterial how the chamber is heated.

rl`he brick-work body is provided with a furnace {rollt-platea2 attachedto the brickront c of the bod and havin a sill d at the floor-level of te doorway. plate is shown in the drawing with cheeks e projectedtherefrom to form the casing of thev hood, and provided, as shown inFig. 3, with flanges f upon theirouter edges, upon which a shield g ismounted movabl to form the outer side of the hood, and-adapted whenlowered to cut o the blast of hot gases when the doorway is not in use.

The inner side at least of the shield is formed of. refractory materialh, and the cheeks e ot the cas l; are lined with re ractory material`sich is preferably formed, as shown in Figs. 3 and 7by extensions e ofthebrick-ront c'. Such extensions of the brick-work require an aperturein the front-plate o, such aperture embracin all the space at the innerside of the hoo, so that the rear of the due and both edges are formedofthe solid briclr-worlr and no part of the metaldront or casing isexposed to the direct heat of the bu gases. The cheeks and theirrefractory lmin are extended downward to the sill thus orming a chamber,before the doorway, wholly closed except an outlet below the bottom ofthe shield when the same is raised. 'lhe hood is thus formed with anupright channel open at the top, with; an .inlet or mouth at the upperedge of the doorway b. ,The outer edges of the anges f of the cas-Y ingare sloped inwardlyv toward the to and the shield is correspondinglyincline which4 makes the upward draft more edective, and the shield 4ishung upon the end of a lever n, as shown in Fig. 5, which lever is @oulcrumed upon the casing by a stud o. rlhe v lever has a weight p to.balance the weight of the shield, and a handle g to raise and lower theshield at leasure.

rlhe inclination o the anges f causes the' 65 shield, by its weight, tolie close to the lange,

he frontndose and the shield may be lowered more or less to limit theopenin above the sill which ives access to the oorway, or by contactwith'the sill, as shown in Fig. 6, to wholly cut oil' any horizontaldirect escape oi the 70 hot gases and confine their escape entirely to nthe hood.

Such use of the shield adapts the hood, without any blast, to ldisposeof all hot gases and wholly prevent their escape toward the operator.

With the addition of the blast, the hood may be enabled when the shieldis raised for access to the doorway, to prevent the escape of the hotgases toward the operator and direct them chiedy into the hood. Theconstruction' thus protects -the operator from heat, whether he isoperating through the open doorway, or the hood be closed as shown inFig. 6. 85

A blast-pipe j is shown located near the mouth ofthe hood and extendedacross the saineparallel with the top o the channel c'. ln Fig. 2, theblast-pipe is shown close to the bottom edge of the shield, and having alongitudinal openingk in its upper side disposed to discharge a blastupwardly into the channel c' at such an angle as to lill the channel anddrive ,all of its contents upwardly. rlhis produces a partial vacuum inthe lower part of the hood which forcibly Y draws upwardly, as indicatedby the arrow Z in Fig. 2, the gases escaping from the doorway ln Fig. 2,the sill d is shown extended 10o from the front c into line with theouter edge of the hood thus cuttin od an direct upward draft oi air intot e ho which would diminish the draft upon the hot gases. l

The space between the under side of the 10e blast-pipe j and the sillpermits the workman to reach the worMng-o 'ening b to manipulate thestock placed in the'furnace'- chamber.

In Fi d, the blast-pipe j is shown disposed midway between the bottomedge of the shield and the furnace front-plate, and is shown in Figsjand d with two rows of blast-holes lc which discharge the blast upwardlyin such directionsas to fill the hood and produce the upward draftdesired. l ln Figli, the blastipeis shown arranged to direct the blast ohquely downward toward the sill and doorway, and thus intercept thethese arrangements of the blast-pipe impel the gases upward into thehood. The cheeks which form the casing of the hood are shown in thedrawing made integral with the furnace front-plate c, and are extendeddown- 125 ward to the sill d and formed each with an aperture m for theinsertion of the blastpipe. The heat of the gases escaping from thedoorway b is so great as' to require a most refractory lining in thehood to pro- 13o outward current of hot gases. All

tect its metallic casing, and the construction shown in Fig. 3 furnishesa brick-work structure on every side of the channel excepting the sidewhich is closed by the shield, which has at least a refractory lining.

Such lining may be made of asbestos or magnesia, or similar materialsadapted to protect the shield from injury by the heat, and especially toprevent the conduction of heat outward, thus protecting the operatorfrom the radiation of heat. The whole shield may be made ofrefractorymaterial. The front brick-work c shown in |Fig. 3 requiresrepairs from time to time, owing to the excessive heat to which the archover the doorway is exposed on its inner and outer sides.

It will be obvious from inspection of Figs.

2 and 1, that the shield g may be readily removed by disconnecting itfrom the lever, or disconnecting the lever from its fulcrum 0, thuspermitting free access to the front brick-work when it is necessary torepair the same.

If the hood be made open at the top, as shown in Fig. 4, the gases aredischarged above the head of the operator and are carried away by theirown levity; but it is immaterial how the gases are conducted from thehood.

The construction of hood shown in the drawing is of the most practicaland effective character and when combined with an adjustable shield andthe sill d below. the mouth of the hood, the draft upwardly in the hoodoperates most effectively to prevent the projection of the hot gasestoward the operator.

Having thus set forth the nature of the invention what is claimed hereinis:

1. The combination, with a furnace having a doorway continuouslydischarging heated gases, of a furnace-front applied to the doorway andhaving a sill below the doorway and a hood sustained upon the front overthe sill and closed at the sides and open at the top to form adraft-flue in constant connection with the doorway, such hood having itsouter side formed of a shield adjustable to and from the sill forrestricting the outward iiow of the gases or, when desired, directingthem wholly upward into the flue.

2. The combination, with a furnace having a doorway continuously'discharging heated gases, of a furnace-front applied to the doorway andhaving a sill below the doorway, a hood sustained upon the front overthe Isill and having a casing inclosing the sides, with the brick-workof the furnace extended within the said sides to protect the casing fromthe hot gases, and the hood having upon its outer side a shieldadjustable to and from the sill, and provided with a reflractory liningto reduce the radiation of eat. y

3.The combination, with a furnace having a doorway continuouslydischarging heated gases, of a furnace-front applied to the doorway andhaving a sill on a level with its Hoor, a hood. sustained upon the frontover the sill and its sides lined with refractory material, a shieldsupported adjustably upon the front and lined with refractory materialand movable to and from the sill to prevent the forward discharge ofgases, when desired, and a blast-pipe sustained at the mouth of thehood, and operating with the hood as'an injector to draw the hot gasesfrom the open doorway into the said hood.

4. The combination, with a furnace having a doorway continuouslydischarging heated gases, of an iron furnace-front applied to thedoorway and having a sill at the bottom of the doorway, a hood open atthe top sustained above the said sill, the iron furnace-front having anaperture at the inner side of the hood, and the inner wall of the'hoodbeing the front brick-work of the furnace, and the sides of the hoodformed of outward extensions from such brick-work, and the outer wall ofthe hood formed of a shield lined with refractory material, whereby thefurnace-front and the casing of the hood are wholly protected from theheat of the gases passing through the hood.

In testimony whereof I have hereunto set my hand. A

WALTER S. ROCKWELL.

